Advanced Functional Materials

Cover image for Vol. 20 Issue 22

November 23, 2010

Volume 20, Issue 22

Pages 3808–4011

  1. Cover Picture

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    1. Hybrid Materials: Silica-Gelatin Hybrids with Tailorable Degradation and Mechanical Properties for Tissue Regeneration (Adv. Funct. Mater. 22/2010) (page 3808)

      Oliver Mahony, Olga Tsigkou, Claudia Ionescu, Caterina Minelli, Lowell Ling, Ruth Hanly, Mark E. Smith, Molly M. Stevens and Julian R. Jones

      Version of Record online: 29 NOV 2010 | DOI: 10.1002/adfm.201090099

      Thumbnail image of graphical abstract

      Oliver Mahony, Julian R. Jones, and co-workers, on page 3835, utilized the enhanced properties of hybrid materials and synthsised novel silica–gelatin hybrids that were formed into macroporous scaffolds. These scaffolds, shown in the false-colour scanning microscopy image, demonstrate great promise in the field of tissue regeneration, because their mechanical and dissolution properties can be carefully tailored for the intended application. Studies with mesenchymal stem cells show a favourable response to the hybrids.

  2. Inside Front Cover

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    1. Energy Materials: Layered LaSrGa3O7-Based Oxide-Ion Conductors: Cooperative Transport Mechanisms and Flexible Structures (Adv. Funct. Mater. 22/2010) (page 3809)

      Cristina Tealdi, Piercarlo Mustarelli and M. Saiful Islam

      Version of Record online: 29 NOV 2010 | DOI: 10.1002/adfm.201090100

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      Novel LaSrGa3O7-based materials are attracting attention as new oxide ion conductors for potential clean energy applications. This image shows results of molecular dynamics simulations within the gallate layers of the crystal structure, and on page 3874, M. Saiful Islam and co-workers provide new insights into ionic motion at the atomic level.

  3. Contents

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  4. Feature Article

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    1. Recent Progress in Nanostructured Cathode Materials for Lithium Secondary Batteries (pages 3818–3834)

      Hyun-Kon Song, Kyu Tae Lee, Min Gyu Kim, Linda F. Nazar and Jaephil Cho

      Version of Record online: 5 OCT 2010 | DOI: 10.1002/adfm.201000231

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      Strategic design of electrode materials in a nanoscale dimension provides breakthroughs in battery technologies. Enhanced cathodic materials drive advances of lithium rechargeable batteries in terms of capacity, rate capability, and cyclability. Various nanostructures such as nanoparticles, nanotubes, nanorods, nanoplates, and even the secondary structure of the primary nano-units enable promising materials for cathodes.

  5. Full Paper

    1. Top of page
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    3. Inside Front Cover
    4. Contents
    5. Feature Article
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    1. Silica-Gelatin Hybrids with Tailorable Degradation and Mechanical Properties for Tissue Regeneration (pages 3835–3845)

      Oliver Mahony, Olga Tsigkou, Claudia Ionescu, Caterina Minelli, Lowell Ling, Ruth Hanly, Mark E. Smith, Molly M. Stevens and Julian R. Jones

      Version of Record online: 23 AUG 2010 | DOI: 10.1002/adfm.201000838

      Thumbnail image of graphical abstract

      Utilizing the enhanced properties of hybrid materials, novel silica-gelatin hybrids are synthesized and formed into macroporous scaffolds (imaged here with X-ray micro-computed tomography). These scaffolds demonstrate great promise in the field of tissue regeneration as the mechanical and dissolution properties can be carefully tailored for the intended application and studies with mesenchymal stem cells show a favorable response to the hybrids.

  6. Frontispiece

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    1. Simultaneous and Dual Emissive Imaging by Micro-Contact Printing on the Surface of Electrostatically Assembled Water-Soluble Poly(p-phenylene) Using FRET (page 3846)

      Chan Kyu Kwak, Dai Geun Kim, Tae Hyeon Kim, Chang-Soo Lee, Minjung Lee and Taek Seung Lee

      Version of Record online: 29 NOV 2010 | DOI: 10.1002/adfm.201090102

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      A simultaneous and dual protein patterning process is developed on the surface of a electrostatically self-assembled blue-emitting poly(p-phenylene) derivative by using a micro-contact-printing technique and FRET. After passivation with bovine serum albumin to prevent nonspecific interactions between ligands and proteins, FRET-amplified fluorescein isothiocyanate labeled streptavidin is patterned with green emission on the blue-emitting background, for a convenient recognition of the pattern by notable color difference.

  7. Full Papers

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    1. Simultaneous and Dual Emissive Imaging by Micro-Contact Printing on the Surface of Electrostatically Assembled Water-Soluble Poly(p-phenylene) Using FRET (pages 3847–3855)

      Chan Kyu Kwak, Dai Geun Kim, Tae Hyeon Kim, Chang-Soo Lee, Minjung Lee and Taek Seung Lee

      Version of Record online: 23 AUG 2010 | DOI: 10.1002/adfm.201000529

      Thumbnail image of graphical abstract

      A simultaneous and dual protein patterning process is developed on the surface of a electrostatically self-assembled blue-emitting poly(p-phenylene) derivative by using a micro-contact-printing technique and FRET. After passivation with bovine serum albumin to prevent nonspecific interactions between ligands and proteins, FRET-amplified fluorescein isothiocyanate labeled streptavidin is patterned with green emission on the blue-emitting background, for a convenient recognition of the pattern by notable color difference.

    2. Optical pH Sensor with Rapid Response Based on a Fluorescein-Intercalated Layered Double Hydroxide (pages 3856–3863)

      Wenying Shi, Shan He, Min Wei, David G. Evans and Xue Duan

      Version of Record online: 27 AUG 2010 | DOI: 10.1002/adfm.201001081

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      An optical pH sensor based on fluorescein intercalated in a layered double hydroxide matrix film is fabricated by electrophoretic deposition. In addition to its facile preparation, its characterization is described, by which its high sensitivity and stability—both mechanical and photostability—as well as its rapid response are demonstrated.

    3. A General and Efficient Route to Fabricate Carbon Nanotube-Metal Nanoparticles and Carbon Nanotube-Inorganic Oxides Hybrids (pages 3864–3873)

      Haiqing Li, Jung Kyu Jo, Lidong Zhang, Chang-Sik Ha, Hongsuk Suh and Il Kim

      Version of Record online: 30 AUG 2010 | DOI: 10.1002/adfm.201001067

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      Novel pyrenyl-moieties-decorated hyperbranched polyglycidol (pHBP) is synthesized and utilized to non-covalently functionalize carbon nanotubes (CNTs). Mediated by as-prepared homogeneous CNT/pHBP sols, a variety of CNT/pHBP/metal nanoparticles (Au, Ag and Pt) and CNT/pHBP/inorganic oxide (SiO2, GeO2 and TiO2) nanohybrids are fabricated in situ. This strategy provides a general and versatile route to efficiently synthesize varied CNT-based nanohybrids.

    4. Layered LaSrGa3O7-Based Oxide-Ion Conductors: Cooperative Transport Mechanisms and Flexible Structures (pages 3874–3880)

      Cristina Tealdi, Piercarlo Mustarelli and M. Saiful Islam

      Version of Record online: 27 AUG 2010 | DOI: 10.1002/adfm.201001137

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      Novel LaSrGa3O7-based materials are attracting attention as promising oxide-ion conductors for clean energy fuel cells. Here, an atomic-scale investigation using advanced simulation techniques indicates that oxide-ion conduction occurs through an interstitialcy or cooperative-type mechanism facilitated by the intrinsic flexibility of the structure.

      Corrected by:

      Correction: Correction: Layered LaSrGa3O7-Based Oxide-Ion Conductors: Cooperative Transport Mechanisms and Flexible Structures

      Vol. 21, Issue 2, 210, Version of Record online: 28 DEC 2010

    5. Magnetic and Acoustically Active Lipospheres for Magnetically Targeted Nucleic Acid Delivery (pages 3881–3894)

      Dialechti Vlaskou, Olga Mykhaylyk, Florian Krötz, Nicole Hellwig, Ritta Renner, Ulrike Schillinger, Bernhard Gleich, Alexandra Heidsieck, Georg Schmitz, Karin Hensel and Christian Plank

      Version of Record online: 6 SEP 2010 | DOI: 10.1002/adfm.200902388

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      Magnetic, acousticallyactive lipospheres (MAALs) are assembled from lipids, nucleic acids, and magnetic nanoparticles in a perfluoropropane atmosphere. MAALs can be used for combined magnetic and ultrasound-targeted delivery of nucleic acids. The figure schematically respresents the MAALs' assembly, the magnetic retention of MAALs loaded with a fluorescence labeled nucleic acid in the blood stream, and nucleic acid deposition triggered by ultrasound.

    6. The Dependence of Device Dark Current on the Active-Layer Morphology of Solution-Processed Organic Photodetectors (pages 3895–3903)

      Panagiotis E. Keivanidis, Peter K. H. Ho, Richard H. Friend and Neil C. Greenham

      Version of Record online: 3 SEP 2010 | DOI: 10.1002/adfm.201000967

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      Minimizing the dark. The correlation between EQE and dark current in bulk heterojunction F8BT:PDI photodiodes is studied for a range of photoactive-layer thicknesses and reverse-bias voltages. For a given value of reverse bias operation, the improvement of the EQE reduces and the dark current increases as the photoactive layer becomes thinner. Dark current originates from the injection of electrons in the electron-accepting molecules (PDI) and from the subsequent carrier transport through the PDI network.

    7. Measuring the External Quantum Efficiency of Two-Terminal Polymer Tandem Solar Cells (pages 3904–3911)

      Jan Gilot, Martijn M. Wienk and René A. J. Janssen

      Version of Record online: 2 SEP 2010 | DOI: 10.1002/adfm.201001167

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      Accurate external quantum efficiency measurements of polymer tandem solar cells require appropriate light and electrical bias conditions to correct for the sub-linear light intensity dependence of the current and field-assisted charge collection in polymer solar cells. A detailed protocol is developed that provides good agreement between the external quantum efficiency and the device characteristics in simulated solar light.

    8. Interface-Engineered Amorphous TiO2-Based Resistive Memory Devices (pages 3912–3917)

      Hu Young Jeong, Jeong Yong Lee and Sung-Yool Choi

      Version of Record online: 2 SEP 2010 | DOI: 10.1002/adfm.201001254

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      Engineering of both interface domains in amorphous TiO2-based RRAM devices makes it possible that the devices are operated at any configuration of metal electrodes. By inserting an active thin metal layer at the top interface and embedding an Al2O3 blocking layer at the bottom interface, enhanced memory properties can be obtained compared to the conventional Al/a-TiO2/Al devices.

    9. Large-Area Fabrication of Periodic Arrays of Nanoholes in Metal Films and Their Application in Biosensing and Plasmonic-Enhanced Photovoltaics (pages 3918–3924)

      Jacson W. Menezes, Jacqueline Ferreira, Marcos J. L. Santos, Lucila Cescato and Alexandre G. Brolo

      Version of Record online: 3 SEP 2010 | DOI: 10.1002/adfm.201001262

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      Patterning oflarge areas of gold films with periodic arrays of nanoholes is achieved using interference lithography. The resulting structures are used as a surface plasmon resonance biosensor and to enhance the photoconversion efficiency in a thin layer organic solar cell.

    10. Amphiphilic Poly(Amino Acid) Nanoparticles Induce Size-Dependent Dendritic Cell Maturation (pages 3925–3931)

      Hyungjin Kim, Tomofumi Uto, Takami Akagi, Masanori Baba and Mitsuru Akashi

      Version of Record online: 8 SEP 2010 | DOI: 10.1002/adfm.201000021

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      Size-regulated nanoparticles (NPs) composed of amphiphilic poly(amino acid) are fabricated to investigate the effects of particle size on NP uptake by dendritic cells (DCs) and their immune stimulatory activities. The size of the NPs has great influence on NP uptake and DC activation. The precisely size-controllable NPs have significant potential as antigen carriers and as an adjuvant for vaccine development.

    11. Towards a Universal Method for the Stable and Clean Functionalization of Inert Perfluoropolymer Nanoparticles: Exploiting Photopolymerizable Amphiphilic Diacetylenes (pages 3932–3940)

      Carlo Morasso, Miriam Colombo, Silvia Ronchi, Laura Polito, Serena Mazzucchelli, Diego Monti, Marco Buscaglia, Tommaso Bellini and Davide Prosperi

      Version of Record online: 3 SEP 2010 | DOI: 10.1002/adfm.201001274

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      Making the unreactive reactive: A smart method for the biofunctionalization of strongly inert perfluoropolymer nanoparticles (PnPs) is presented, using a stable coating with novel diacetylenic compounds followed by clean UV photopolymerization to generate reactive functionalities on the PnP surface. This method further allows fine tuning of the amount of conjugated biomolecules, which can be sensitively and straightforwardly quantified.

    12. Programmed High-Hole-Mobility Supramolecular Polymers from Disk-Shaped Molecules (pages 3941–3947)

      Wei Zhang, Kenji Ochi, Michiya Fujiki, Masanobu Naito, Masaaki Ishikawa, Kei-ichi Kaneto, Wataru Takashima, Akinori Saeki and Shu Seki

      Version of Record online: 3 SEP 2010 | DOI: 10.1002/adfm.201001072

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      Soluble ttbPcAlF self-assembles into 2D arrays of very-high-MW 1D-Pc supramolecular polymers. 1D-ttbPcAlF with a cofacial ring spacing of ∼0.36 nm and an interchain distance of ∼1.7 nm, self-assemblies into 2D-nanosheets (∼140 nm in length, ∼20 nm in width). The film shows a minimum hole-mobility of ∼0.3 cm2 V−1 s−1 and a fairly high dark dc-conductivity of ∼1 × 10−3 S cm−1.

    13. Galactose Encapsulated Multifunctional Nanoparticle for HepG2 Cell Internalization (pages 3948–3958)

      Chian-Hui Lai, Chia-Yi Lin, Huan-Ting Wu, Hau-Shien Chan, Yung-Jen Chuang, Chien-Tien Chen and Chun-Cheng Lin

      Version of Record online: 8 SEP 2010 | DOI: 10.1002/adfm.201000461

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      A multifunctional magnetic nanoparticle (MNP) with fluorescent, magnetic, and targeting properties is shown to be specifically ingested by HepG2 cells that abundantly express asialoglycoprotein receptors (ASGP-R) on their surfaces. The spatial orientation of the pre-assembled multivalent galactosyl ligand influences the MNP uptake by the HepG2 cell.

    14. Higher Molecular Weight Leads to Improved Photoresponsivity, Charge Transport and Interfacial Ordering in a Narrow Bandgap Semiconducting Polymer (pages 3959–3965)

      Minghong Tong, Shinuk Cho, James T. Rogers, Kristin Schmidt, Ben B. Y. Hsu, Daniel Moses, Robert C. Coffin, Edward J. Kramer, Guillermo C. Bazan and Alan J. Heeger

      Version of Record online: 3 SEP 2010 | DOI: 10.1002/adfm.201001271

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      Increasing the molecular weight of the low-bandgap semiconducting copolymer, Si-PDTBT, leads to increased interfacial order of thin films. Whereas lower molecular weight (LMn) Si-PDTBT shows no ordering, higher molecular weight (HMn) Si-PDTBT exhibits π-π stacking of the conjugated backbone in an edge-on configuration near the interface with the substrate, which is appropriate to significantly increase the carrier mobility in the FET devices.

  8. Frontispiece

    1. Top of page
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    1. Ultrasensitive and Selective Detection of a Prognostic Indicator in Early-Stage Cancer Using Graphene Oxide and Carbon Nanotubes (page 3966)

      Xiaohui Wang, Chunyan Wang, Konggang Qu, Yujun Song, Jinsong Ren, Daisuke Miyoshi, Naoki Sugimoto and Xiaogang Qu

      Version of Record online: 29 NOV 2010 | DOI: 10.1002/adfm.201090103

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      A target-directed peptide modifed graphene oxide can be used for ultra-sensitive and selective detection of a prognostic indicator in early-stage cancer, cyclin A2. The direct detection limit using graphene oxide is 0.5 nM, 10-fold better than using SWNTs, and 1200-fold better than the latest reported assay using chemically modified fluorescent peptide.

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    1. Ultrasensitive and Selective Detection of a Prognostic Indicator in Early-Stage Cancer Using Graphene Oxide and Carbon Nanotubes (pages 3967–3971)

      Xiaohui Wang, Chunyan Wang, Konggang Qu, Yujun Song, Jinsong Ren, Daisuke Miyoshi, Naoki Sugimoto and Xiaogang Qu

      Version of Record online: 30 AUG 2010 | DOI: 10.1002/adfm.201001118

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      A target-directed peptide modifed graphene oxide can be used for ultra-sensitive and selective detection of a prognostic indicator in early-stage cancer, cyclin A2. The direct detection limit using graphene oxide is 0.5 nM, 10-fold better than using SWNTs, and 1200-fold better than the latest reported assay using chemically modified fluorescent peptide.

    2. Efficient Assembly of Bridged β-Ga2O3 Nanowires for Solar-Blind Photodetection (pages 3972–3978)

      Yanbo Li, Takero Tokizono, Meiyong Liao, Miao Zhong, Yasuo Koide, Ichiro Yamada and Jean-Jacques Delaunay

      Version of Record online: 30 AUG 2010 | DOI: 10.1002/adfm.201001140

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      β-Ga2O3 nanowires are assembled into a bridged structure in a single-step chemical vapor deposition process. High responsivity, fast photocurrent decay, and excellent spectral selectivity for solar-blind photodetection are demonstrated with the bridged β-Ga2O3 nanowires. Investigations into the effects of defect densities in β-Ga2O3 nanowires show that their photoresponse properties could be tailored for different applications.

    3. Detonation Nanodiamond and Onion-Like-Carbon-Embedded Polyaniline for Supercapacitors (pages 3979–3986)

      Igor Kovalenko, David G. Bucknall and Gleb Yushin

      Version of Record online: 30 AUG 2010 | DOI: 10.1002/adfm.201000906

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      Embedding detonation nanodiamond (ND) in polyaniline (PANI) dramatically improves cycle stability and specific capacitance of PANI-based electrochemical capacitors. A strong bonding between PANI and nanoparticles is an important factor for maintaining good electrical conductivity within a PANI-ND electrode during galvanostatic cycling, while the nanopowder conductivity is not.

    4. Single-Crystalline Dodecahedral and Octodecahedralα-Fe2O3 Particles Synthesized by a Fluoride Anion–Assisted Hydrothermal Method (pages 3987–3996)

      Baoliang Lv, Zhenyu Liu, Hong Tian, Yao Xu, Dong Wu and Yuhan Sun

      Version of Record online: 27 AUG 2010 | DOI: 10.1002/adfm.201001021

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      In the morphology control of α-Fe2O3 polyhedral particles, fluoride anions play a crucial role. When [F] > 24 mM, slower growth along [100] and faster growth along [001] induce the formation of dodecahedral particles. When [F] < 24 mM, six symmetrical (111) planes are present on the two tips of the dodecahedra, and thus octodecahedra are formed.

    5. Double-Network Interpenetrating Bone Cement via in situ Hybridization Protocol (pages 3997–4011)

      Jing Wang, Changsheng Liu, Yufei Liu and Shuo Zhang

      Version of Record online: 22 SEP 2010 | DOI: 10.1002/adfm.201000995

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      Aninterpenetrating double-network is introduced into calcium phosphate bone-based bone cement via in situ polymerization and hydration. The rigid inorganic cement is responsible for strength while the soft and relaxed hydrogel moiety acts as an energy-absorber. As a result, an improved, mechanically strong bone cement is obtained via the double-network strategy.

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